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plotly-dash custom component. Adds Plotly.extendTraces() support to dash_core_components.Graph()

Project description


PyPI PyPI - Python Version PyPI - License

dash-extendable-graph is a Dash component library. This library contains a single component: ExtendableGraph. The component is a fork of the Graph() component of dash-core-components (v 0.43.0), with an extra property (extendData) that allows Graph traces to be drawn through Plotly.extendTraces() instead of Plotly.react().


Get started with:

  1. Install Dash and dependencies:
$ pip install -r requirements.txt
  1. Install dash-extendable-graph
$ pip install dash-extendable-graph
  1. Run python
  2. Visit http://localhost:8050 in your web browser


import dash_extendable_graph as deg
import dash
from dash.dependencies import Input, Output, State
import dash_html_components as html
import dash_core_components as dcc
import random

app = dash.Dash(__name__)

app.scripts.config.serve_locally = True
app.css.config.serve_locally = True

app.layout = html.Div([
        config={'showAxisDragHandles': True,
                'showAxisRangeEntryBoxes': True,
                'modeBarButtonsToRemove': [
                'displaylogo': False,
            data=[{'x': [0],
                   'y': [0],

@app.callback(Output('extendablegraph_example', 'extendData'),
              [Input('interval_extendablegraph_update', 'n_intervals')],
              [State('extendablegraph_example', 'figure')])
def update_extendData(n_intervals, existing):
    x_new = existing['data'][0]['x'][-1] + 1
    y_new = random.random()
    return [dict(x=[x_new], y=[y_new])]

if __name__ == '__main__':



Local Installation

  1. Dependencies
    $ npm install
    $ virtualenv venv
    $ . venv/bin/activate
    $ pip install -r requirements.txt
    $ pip install -r tests/requirements.txt
  2. Build
    $ npm run build:all
  3. Check out the component via component-playground
    $ npm run start
    The demo app is in src/demo
  4. Check out the sample Dash application using the component
    $ python


  • Write tests for your component.
    • A sample test is available in tests/, it will load and you can then automate interactions with selenium.
    • Run the tests with $ pytest tests.
    • The Dash team uses these types of integration tests extensively. Browse the Dash component code on GitHub for more examples of testing (e.g.
  • Add custom styles to your component by putting your custom CSS files into your distribution folder (dash_extendable_graph).
    • Make sure that they are referenced in so that they get properly included when you're ready to publish your component.
    • Make sure the stylesheets are added to the _css_dist dict in dash_extendable_graph/ so dash will serve them automatically when the component suite is requested.
  • Review your code

Create a production build and publish:

$ npm run build:all
$ rm -rf dist
$ python sdist
$ twine upload dist/*
$ npm publish

Test your tarball by copying it into a new environment and installing it locally: $ pip install dash_extendable_graph-X.X.X.tar.gz

Publishing your component to NPM will make the JavaScript bundles available on the unpkg CDN. By default, Dash servers the component library's CSS and JS from the remote unpkg CDN, so if you haven't published the component package to NPM you'll need to set the serve_locally flags to True (unless you choose False on publish_on_npm). We will eventually make serve_locally=True the default, follow our progress in this issue.

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dash_extendable_graph-0.0.4.tar.gz (331.8 kB view hashes)

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